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glfwSetWindowFocusCallback

This function sets the focus callback of the specified window, which is called when the window gains or loses input focus.

function glfwSetWindowFocusCallback(\GLFWwindow $window, callable $callback) : void

After the focus callback is called for a window that lost input focus, synthetic key and mouse button release events will be generated for all such that had been pressed. For more information, see glfwSetKeyCallback and glfwSetMouseButtonCallback.

Example: 

glfwSetWindowFocusCallback($window, function($focused) {
    echo "Window focus changed to: " . $focused . PHP_EOL;
});

arguments
  1. \GLFWwindow $window The window whose callback to set.
  2. callable $callback
returns

void

Copyright

This documentation page is prased from the glfw3.h header file, and only modified to fit the PHP-GFLW extension bindings. The original documentation copyright is as follows:

Copyright (c) 2002-2006 Marcus Geelnard
Copyright (c) 2006-2019 Camilla Löwy
https://www.glfw.org/license